The increasing popularity of using online auctions has led to an increase in fraudulent activity. This is usually performed on an auction website by creating a very attractive auction lot, such as a low starting bid level. Once a buyer wins a lot and pays for it, the fraudulent seller will either not proceed with the delivery, or send a less valuable version of the purchased item (replicated, used, refurbished, etc.). Protection to prevent such acts has become available, for example
PayPal's buyer protection policy. As
PayPal handles the transaction, it has the ability to hold funds until a complaint is resolved and the victim can be compensated. Auction fraud makes up a large percentage of complaints received by the
FBI’s Internet Crime Complaint Center (around 63% in 2005 and 45% in 2006).
Shill bidding Shill bidding is the most prominent type of online auction fraud where sellers themselves submit bids to increase the price of an item they have put up for sale, without intending to win. Shill bidding is also one of the most difficult types of fraud to detect, since it is usually conducted by the seller in collusion with one or more bidders in the auction. By taking part in the process, an individual is sometimes breaking the law, depending on the relevant jurisdiction, for example breaking the
European Union fair trading rules which carries out a fine of up to £5,000 in the
United Kingdom.
Shield bidding Shield bidding is a technique whereby a buyer uses another account (called a "shield") to discourage other competitors from bidding by artificially increasing the price and then at the last moment withdrawing their bid to allow the actual buyer to win the auction with a lower price. Most online auction sites do not allow withdrawal of bids except in specified circumstances, making this technique impossible to carry out except on sites where such a rule is not implemented.
Spotting Shills and Shields It is difficult to spot a dirty technique being used by an anonymous or pseudonymous person in online auctions, but it is certainly doable. It can be revealed by examining a seller's auction history and looking for an account which has bid on every or almost every auction of that seller. If there is someone who meets those characteristics, it is most likely a shill using that account to increase the price. A shield can be spotted similarly to a shill. By doing a search of a person's won auctions, it can be found out whether or not there is another account participating in the same auctions without ever winning anything. If there is, it is possible that the person is using a shield to help them become successful in auctions.
Sale of stolen goods Online auction websites can be used by thieves or
fences to sell stolen goods to unsuspecting buyers. According to police statistics, there were over 8000 crimes involving stolen goods, fraud, or deception reported on eBay in 2009. It has become common practice for organized criminals to steal in-demand items, often in bulk, then sell them online. It is thought to be a safer option than fencing stolen items due to the anonymity and worldwide market online auctions provide. ==Interests protection==